flex-grow - CSS: Cascading Style Sheets 编辑

The flex-grow CSS property sets the flex grow factor of a flex item's main size.

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Syntax

/* <number> values */
flex-grow: 3;
flex-grow: 0.6;

/* Global values */
flex-grow: inherit;
flex-grow: initial;
flex-grow: unset;

The flex-grow property is specified as a single <number>.

Values

<number>

See <number>. Negative values are invalid. Defaults to 0.

Description

This property specifies how much of the remaining space in the flex container should be assigned to the item (the flex grow factor).

The main size is either width or height of the item which is dependent on the flex-direction value.

The remaining space is the size of the flex container minus the size of all flex items' sizes together. If all sibling items have the same flex grow factor, then all items will receive the same share of remaining space, otherwise it is distributed according to the ratio defined by the different flex grow factors.

flex-grow is used alongside the other flex properties flex-shrink and flex-basis, and normally defined using the flex shorthand to ensure all values are set.

Formal definition

Initial value	0
Applies to	flex items, including in-flow pseudo-elements
Inherited	no
Computed value	as specified
Animation type	a number

Formal syntax

<number>

Examples

Setting flex item grow factor

HTML

<h4>This is a Flex-Grow</h4>
<h5>A,B,C and F are flex-grow:1 . D and E are flex-grow:2 .</h5>
<div id="content">
  <div class="box" style="background-color:red;">A</div>
  <div class="box" style="background-color:lightblue;">B</div>
  <div class="box" style="background-color:yellow;">C</div>
  <div class="box1" style="background-color:brown;">D</div>
  <div class="box1" style="background-color:lightgreen;">E</div>
  <div class="box" style="background-color:brown;">F</div>
</div>

CSS

#content {
  display: flex;

  justify-content: space-around;
  flex-flow: row wrap;
  align-items: stretch;
}

.box {
  flex-grow: 1;
  border: 3px solid rgba(0,0,0,.2);
}

.box1 {
  flex-grow: 2;
  border: 3px solid rgba(0,0,0,.2);
}

Result

Specifications

Specification	Status	Comment
CSS Flexible Box Layout Module The definition of 'flex-grow' in that specification.	Candidate Recommendation	Initial definition

Browser compatibility

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The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• CSS Flexbox Guide: Basic Concepts of Flexbox
• CSS Flexbox Guide: Controlling Ratios of flex items along the main axis
• `flex-grow` is weird. Or is it? article by Manuel Matuzovic on CSS-Tricks, which illustrates how flex-grow works